Rayleigh (unit)

The Rayleigh ( unit symbol : R ), named after the British physicist Robert Strutt, 4th Baron Rayleigh , is a unit of measure for the intensity of the emission rate of photons of the night sky light (airglow):

${\displaystyle 1\,\mathrm {R=10^{10}\,{\frac {Photonen}{cm^{2}\cdot s}}} }$

The Rayleigh should not be confused with the CGS unit Rayl of the specific acoustic impedance .

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• Günter Guilino: Expansion of an alternating light monochromator and its application for measuring air luminescence during twilight and at night (dissertation) . Springer-Verlag, Berlin / Heidelberg 1964, p. 29.
• Wilhelm Raith (Ed.): Textbook of Experimental Physics Vol. 7. Earth and Planets . Walter de Gruyter, Berlin / New York 2001, p. 662.